> One more question. Why do not we move the spheres through the periodic > boundaries instead of updating their positions? Would this be > possible? I mean, like treating the periodic boundaries as walls. ATM, > we use the rule of continuum mechanics to updated positions of > discrete particles, but is this correct dealing with a particulate > system? Would not be better to apply the strain rate to the moving > periodic boundaries and as a consequence moving the balls? The boundaries don't really exist, they are purely numerical entities correspoding to Cell::refSize and Cell::trsf. Particles are free to move in any way, they only interact as if they were copied in all (infinite number of) periodic cells. Hope this answers your question.
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